Science - Chemistry

Question 1

Neutralisation reaction

Answer 1

The chemical reaction when an acid reacts with a base to create water and a salt
- the salt contains the anion from the acid and the cation from the base

Question 2

Acid

Answer 2

A substance that releases H+ when dissolved in water and has a low pH level

Question 3

Base

Answer 3

A substance that reacts with acids and is high on the pH scale

Question 4

Moles (mol or n)

Answer 4

Moles are a measurement for the amount of a substance
- 1 mole of a substance is equal to 6.02 x 10^23 particles of Avogadro’s number

Question 5

Molar Mass (M)

Answer 5

This is the mass of 6.02 x 10^23 particles of a particular substance
- It is the atomic weight on the periodic table

Question 6

Molarity (c or M)

Answer 6

The amount of moles per litre of water or solvent

Question 7

Solution

Answer 7

A mixture of a solvent and solute

Question 8

Solvent

Answer 8

Something of a which a solute can dissolve into

Question 9

Solute

Answer 9

A substance that can dissolve into a solvent

Question 10

Soluble

Answer 10

It can dissolve

Question 11

Moles to grams (Vis Versa)

Answer 11

To convert from Moles to grams:
- Molar Mass * Moles = grams
To convert from Grams to Moles:
- Grams / Molar Mass = Moles

Question 12

Moles to Molarity (Vis Versa)

Answer 12

To convert from Moles to Molarity:
- Moles / litres = Concentration
to convert from Molarity to Moles:
- Litres * Concentration = Moles

Question 13

Titration

Answer 13

Otherwise known as volumetric analysis, it is process of determining the concentration of a substance (analyte) with a known volume by reacting it with substance of a known concentration.
- By doing so the point where they neutralise and the indicator activates, the volume of the known concentration which reacts with the known volume of the unknown concentration
- Thus the concentration can then be found

Question 14

Calculating titration

Answer 14

1. Find the molar ration between the base and acid
2. Multiply the the average titre with the known concentration to find moles
3. Use molar ratio to find moles for the unknown concentration or aliquot
4. Divide moles with known volume in aliquot to find concentration

Question 15

Aliquot

Answer 15

The known amount of substance that has an unknown concentration

Question 16

Pipette

Answer 16

The device used to measure the amount needed for the aliquot

Question 17

Burette

Answer 17

The tube used to carry the substance with the known concentration and show the titre

Question 18

Titre

Answer 18

The volume of substance with the known concentration that it takes to neutralize the aliquot

Question 19

Molar Ratio

Answer 19

The ratio between the co - efficient of the reactants